Invaginator for gastroesophageal flap valve restoration device

ABSTRACT

An assembly for restoring a gastroesophageal flap valve includes a restoration device substantially free for rotation. The assembly comprises an elongated member configured to be fed through a throat, down an adjoining esophagus and into an associated stomach. The elongated member has a distal end. The assembly further comprises a gastroesophageal flap valve restoration device carried on the distal end of the elongated member for placement in the stomach, and an invaginator carried by the elongated member. The invaginator is configured to grip the esophagus and the elongated member and invaginator are coupled for restricted relative axial movement and substantially free relative rotational movement.

FIELD OF THE INVENTION

The present invention generally relates to a gastroesophageal flap valverestoration device for treating gastroesophageal reflux disease. Thepresent invention more particularly relates to an invaginator for use insuch devices that grips the esophagus during treatment and restrictsaxial device movement while permitting relatively free rotational devicemovement.

BACKGROUND

Gastroesophageal reflux disease (GERD) is a chronic condition caused bythe failure of the anti-reflux barrier located at the gastroesophagealjunction to keep the contents of the stomach from splashing into theesophagus. The splashing is known as gastroesophageal reflux. Thestomach acid is designed to digest meat, and will digest esophagealtissue when persistently splashed into the esophagus.

A principal reason for regurgitation associated with GERD is themechanical failure of a deteriorated gastroesophageal flap to close andseal against high pressure in the stomach. Due to reasons includinglifestyle, a Grade I normal gastroesophageal flap may deteriorate into amalfunctioning Grade III or absent valve Grade IV gastroesophageal flap.With a deteriorated gastroesophageal flap, the stomach contents are morelikely to be regurgitated into the esophagus, the mouth, and even thelungs. The regurgitation is referred to as “heartburn” because the mostcommon symptom is a burning discomfort in the chest under thebreastbone. Burning discomfort in the chest and regurgitation (burpingup) of sour-tasting gastric juice into the mouth are classic symptoms ofgastroesophageal reflux disease (GERD). When stomach acid isregurgitated into the esophagus, it is usually cleared quickly byesophageal contractions. Heartburn (backwashing of stomach acid and bileonto the esophagus) results when stomach acid is frequently regurgitatedinto the esophagus and the esophageal wall is inflamed.

Complications develop for some people who have GERD. Esophagitis(inflammation of the esophagus) with erosions and ulcerations (breaks inthe lining of the esophagus) can occur from repeated and prolonged acidexposure. If these breaks are deep, bleeding or scarring of theesophagus with formation of a stricture (narrowing of the esophagus) canoccur. If the esophagus narrows significantly, then food sticks in theesophagus and the symptom is known as dysphagia. GERD has been shown tobe one of the most important risk factors for the development ofesophageal adenocarcinoma. In a subset of people who have severe GERD,if acid exposure continues, the injured squamous lining is replaced by aprecancerous lining (called Barrett's Esophagus) in which a cancerousesophageal adenocarcinoma can develop.

Other complications of GERD may not appear to be related to esophagealdisease at all. Some people with GERD may develop recurrent pneumonia(lung infection), asthma (wheezing), or a chronic cough from acidbacking up into the esophagus and all the way up through the upperesophageal sphincter into the lungs. In many instances, this occurs atnight, while the person is in a supine position and sleeping.Occasionally, a person with severe GERD will be awakened from sleep witha choking sensation. Hoarseness can also occur due to acid reaching thevocal cords, causing a chronic inflammation or injury. GERD neverimproves without intervention. Life style changes combined with bothmedical and surgical treatments exist for GERD. Medical therapiesinclude antacids and proton pump inhibitors. However, the medicaltherapies only mask the reflux. Patients still get reflux and perhapsemphysema because of particles refluxed into the lungs. Barrett'sesophagus results in about 10% of the GERD cases. The esophagealepithelium changes into tissue that tends to become cancerous fromrepeated acid washing despite the medication.

Several open laparotomy and laparoscopic surgical procedures areavailable for treating GERD. One surgical approach is the Nissenfundoplication. The Nissen approach typically involves a 360-degree wrapof the fundus around the gastroesophageal junction. The procedure has ahigh incidence of postoperative complications. The Nissen approachcreates a 360-degree moveable flap without a fixed portion. Hence,Nissen does not restore the normal movable flap. The patient cannot burpbecause the fundus was used to make the repair, and may frequentlyexperience dysphagia. Another surgical approach to treating GERD is theBelsey Mark IV (Belsey) fundoplication. The Belsey procedure involvescreating a valve by suturing a portion of the stomach to an anteriorsurface of the esophagus. It reduces some of the postoperativecomplications encountered with the Nissen fundoplication, but still doesnot restore the normal movable flap. None of these procedures fullyrestores the normal anatomical anatomy or produces a normallyfunctioning gastroesophageal junction. Another surgical approach is theHill repair. In the Hill repair, the gastroesophageal junction isanchored to the posterior abdominal areas, and a 180-degree valve iscreated by a system of sutures. The Hill procedure restores the moveableflap, the cardiac notch and the Angle of His. However, all of thesesurgical procedures are very invasive, regardless of whether done as alaparoscopic or an open procedure.

New, less surgically invasive approaches to treating GERD involvetransoral endoscopic procedures. One procedure contemplates a machinedevice with robotic arms that is inserted transorally into the stomach.While observing through an endoscope, an endoscopist guides the machinewithin the stomach to engage a portion of the fundus with acorkscrew-like device on one arm. The arm then pulls on the engagedportion to create a fold of tissue or radial plication at thegastroesophageal junction. Another arm of the machine pinches the excesstissue together and fastens the excess tissue with one pre-tied implant.This procedure does not restore normal anatomy. The fold created doesnot have anything in common with a valve. In fact, the direction of theradial fold prevents the fold or plication from acting as a flap of avalve.

Another transoral procedure contemplates making a fold of fundus tissuenear the deteriorated gastroesophageal flap to recreate the loweresophageal sphincter (LES). The procedure requires placing multipleU-shaped tissue clips around the folded fundus to hold it in shape andin place.

This and the previously discussed procedure are both highly dependent onthe skill, experience, aggressiveness, and courage of the endoscopist.In addition, these and other procedures may involve esophageal tissue inthe repair. Esophageal tissue is fragile and weak, in part due to thefact, that the esophagus is not covered by serosa, a layer of verysturdy, yet very thin tissue, covering and stabilizing allintraabdominal organs, similar like a fascia covering and stabilizingmuscle. Involvement of esophageal tissue in the repair of agastroesophageal flap valve poses unnecessary risks to the patient, suchas an increased risk of fistulas between the esophagus and the stomach.

A new and improved apparatus and method for restoration of agastroesophageal flap valve is fully disclosed in U.S. Pat. No.6,790,214, issued Sep. 14, 2004, is assigned to the assignee of thisinvention, and is incorporated herein by reference. That apparatus andmethod provides a transoral endoscopic gastroesophageal flap valverestoration. A longitudinal member arranged for transoral placement intoa stomach carries a tissue shaper that non-invasively grips and shapesstomach tissue. A tissue fixation device is then deployed to maintainthe shaped stomach tissue in a shape approximating a gastroesophagealflap.

Whenever tissue is to be maintained in a shape as, for example, in theimproved assembly last mentioned above, it is necessary to first gripstomach tissue and then fasten at least two layers of gripped tissuetogether. In applications such as gastroesophageal flap valverestoration, it is desirable to grip stomach tissue displaced from theesophageal opening into the stomach so that when the stomach tissue ispulled aborally to form a flap, the flap will have sufficient length tocover the opening and function as a flap valve. With thegastroesophageal anatomy thus restored, the GERD will be effectivelytreated.

Locating the proper gripping point in the stomach is not a simplematter. Once a desired gripping point is found, it is then necessary toform the GEFV flap and maintain its shape without involving theesophageal tissue. Still further, these manipulations of the stomachtissue must be incrementally repeated many times as the device isrotated to form a complete valve. Such further manipulation must repeatthe dimensions of the manipulated stomach tissue to result in a valvestructure of uniform geometry. This requires the device to be disposedin a repeatable axial position for each manipulation. Unfortunately,this is extremely difficult under the circumstances provided by theanatomy of the stomach.

Hence, there is a need in the art for techniques and devices, whichenable repeatable uniform manipulations of stomach tissue from withinthe stomach to restore a GEFV. The present invention addresses these andother issues.

SUMMARY

The invention provides an assembly comprising a medical instrumentincluding an elongated member configured to be fed into a body spacehaving sidewalls and an invaginator carried by the elongated member, theinvaginator being configured to grip the body space sidewalls. Theelongated member and invaginator are coupled for restricted relativeaxial movement and substantially free relative rotational movement.

The invention further provides an assembly comprising an elongatedmember configured to be fed through a throat, down an adjoiningesophagus and into an associated stomach. The elongated member has adistal end. The assembly further includes a gastroesophageal flap valverestoration device carried on the distal end of the elongated member forplacement in the stomach and an invaginator carried by the elongatedmember. The invaginator is configured to grip the esophagus and theelongated member and invaginator are coupled for restricted relativeaxial movement and substantially free relative rotational movement.

The invaginator may be configured to non-invasively grip the esophagus.To this end, the invaginator may be configured to vacuum-grip theesophagus.

The assembly may further comprise a conduit that couples the invaginatorto a vacuum source. The conduit may comprise a lumen formed in theelongated member. Alternatively, the conduit may comprise an elongatedtubular member independent of the elongated member.

The invaginator preferably circumscribes the elongated member. Theassembly may further comprise a bearing assembly between the invaginatorand the elongated member.

The bearing assembly may comprise at least one bearing sleeve. Thebearing assembly may comprise an inner bearing sleeve and an outerbearing sleeve. The inner bearing sleeve and outer bearing sleeve arepreferably coaxially disposed between the invaginator and the elongatedmember. A lubricant may be applied to the bearing assembly.

The elongated member may include a discrete axial length portion ofreduced cross-sectional dimension and the invaginator may be confinedwithin the discrete axial length portion to restrict its axial movement.Alternatively, the invaginator may extend substantially coextensivelyalong the elongated member.

The invention further provides an assembly comprising an elongatedmember configured to be fed through a throat, down an adjoiningesophagus and into an associated stomach, the elongated member having adistal end, a gastroesophageal flap valve restoration device carried onthe distal end of the elongated member for placement in the stomach, andan invaginator carried by and circumscribing the elongated member. Theinvaginator is configured to vacuum grip the esophagus and the elongatedmember and invaginator are coupled for restricted relative axialmovement and substantially free relative rotational movement.

The invention further provides an assembly comprising an elongatedmember having a distal end and configured to be fed through a throat,down an adjoining esophagus and into an associated stomach, agastroesophageal flap valve restoration device carried on the distal endof the elongated member for placement in the stomach, an invaginatorcarried by and circumscribing the elongated member, the invaginatorbeing configured to vacuum grip the esophagus, and a bearing assemblybetween the invaginator and the elongated member. The bearing assemblycouples the elongated member and invaginator for restricted relativeaxial movement and substantially free relative rotational movement.

BRIEF DESCRIPTION OF THE DRAWINGS

The features of the present invention which are believed to be novel areset forth with particularity in the appended claims. The invention,together with further objects and advantages thereof, may best beunderstood by making reference to the following description taken inconjunction with the accompanying drawings, in the several figures ofwhich like reference numerals identify like elements, and wherein:

FIG. 1 is a front cross-sectional view of theesophageal-gastro-intestinal tract from a lower portion of the esophagusto the duodenum;

FIG. 2 is a front cross-sectional view of theesophageal-gastro-intestinal tract illustrating a Grade I normalappearance movable flap of the gastroesophageal flap valve (in dashedlines) and a Grade III reflux appearance gastroesophageal flap of thegastroesophageal flap valve (in solid lines);

FIG. 3 is a side view of an apparatus for restoring a GEFV having aninvaginator according to an embodiment of the invention;

FIG. 4 is a partial side view of the apparatus of FIG. 3 showing theinvaginator according to an embodiment of the invention in greaterdetail;

FIG. 5 is a side view of another apparatus for restoring a GEFVincluding an invaginator according to another embodiment of theinvention;

FIG. 6 is a partial side view of the apparatus of FIG. 5 showing theinvaginator in greater detail; and

FIG. 7 is a side view of an apparatus according to a still furtherembodiment.

DETAILED DESCRIPTION

FIG. 1 is a front cross-sectional view of theesophageal-gastro-intestinal tract 40 from a lower portion of theesophagus 41 to the duodenum 42. The stomach 43 is characterized by thegreater curvature 44 on the anatomical left side and the lessercurvature 45 on the anatomical right side. The tissue of the outersurfaces of those curvatures is referred to in the art as serosa tissue.As will be seen subsequently, the nature of the serosa tissue is used toadvantage for its ability to bond to like serosa tissue.

The fundus 46 of the greater curvature 44 forms the superior portion ofthe stomach 43, and traps gas and air bubbles for burping. Theesophageal tract 41 enters the stomach 43 at an esophageal orifice belowthe superior portion of the fundus 46, forming a cardiac notch 47 and anacute angle with respect to the fundus 46 known as the Angle of His 57.The lower esophageal sphincter (LES) 48 is a discriminating sphincterable to distinguish between burping gas, liquids, and solids, and worksin conjunction with the fundus 46 to burp. The gastroesophageal flapvalve (GEFV) 49 includes a moveable portion and an opposing morestationary portion.

The moveable portion of the GEFV 49 is an approximately 180 degree,semicircular, gastroesophageal flap 50 (alternatively referred to as a“normal moveable flap” or “moveable flap”) formed of tissue at theintersection between the esophagus 41 and the stomach 43. The opposingmore stationary portion of the GEFV 49 comprises a portion of the lessercurvature 45 of the stomach 43 adjacent to its junction with theesophagus 41. The gastroesophageal flap 50 of the GEFV 49 principallycomprises tissue adjacent to the fundus 46 portion of the stomach 43. Itis about 4 to 5 cm long (51) at it longest portion, and its length maytaper at its anterior and posterior ends.

The gastroesophageal flap 50 is partially held against the lessercurvature 45 portion of the stomach 43 by the pressure differentialbetween the stomach 43 and the thorax, and partially by the resiliencyand the anatomical structure of the GEFV 49, thus providing the valvingfunction. The GEFV 49 is similar to a flutter valve, with thegastroesophageal flap 50 being flexible and closeable against the othermore stationary side.

The esophageal tract is controlled by an upper esophageal sphincter(UES)in the neck near the mouth for swallowing, and by the LES 48 andthe GEFV 49 at the stomach. The normal anti-reflux barrier is primarilyformed by the LES 48 and the GEFV 49 acting in concert to allow food andliquid to enter the stomach, and to considerably resist reflux ofstomach contents into the esophagus 41 past the gastroesophageal tissuejunction 52. Tissue aboral of the gastroesophageal tissue junction 52 isgenerally considered part of the stomach because the tissue protectedfrom stomach acid by its own protective mechanisms. Tissue oral of thegastroesophageal junction 52 is generally considered part of theesophagus and it is not protected from injury by prolonged exposure tostomach acid. At the gastroesophageal junction 52, the juncture of thestomach and esophageal tissues form a zigzag line, which is sometimesreferred to as the “Z-line.” For the purposes of these specifications,including the claims, “stomach” means the tissue aboral of thegastroesophageal junction 52.

FIG. 2 is a front cross-sectional view of anesophageal-gastro-intestinal tract illustrating a Grade I normalappearance movable flap 50 of the GEFV 49 (shown in dashed lines) and adeteriorated Grade III gastroesophageal flap 55 of the GEFV 49 (shown insolid lines). As previously mentioned, a principal reason forregurgitation associated with GERD is the mechanical failure of thedeteriorated (or reflux appearance) gastroesophageal flap 55 of the GEFV49 to close and seal against the higher pressure in the stomach. Due toreasons including lifestyle, a Grade I normal gastroesophageal flap 50of the GEFV 49 may deteriorate into a Grade III deterioratedgastroesophageal flap 55. The anatomical results of the deteriorationinclude moving a portion of the esophagus 41 that includes thegastroesophageal junction 52 and LES 48 toward the mouth, straighteningof the cardiac notch 47, and increasing the Angle of His 57. Thiseffectively reshapes the anatomy aboral of the gastroesophageal junction52 and forms a flattened fundus 56.

The deteriorated gastroesophageal flap 55 shown in FIG. 2 has agastroesophageal flap valve 49 and cardiac notch 47 that are bothsignificantly degraded. Dr. Hill and colleagues developed a gradingsystem to describe the appearance of the GEFV and the likelihood that apatient will experience chronic acid reflux. L. D. Hill, et al., Thegastroesophageal flap valve: in vitro and in vivo observations,Gastrointestinal Endoscopy 1996:44:541-547. Under Dr. Hill's gradingsystem, the normal movable flap 50 of the GEFV 49 illustrates a Grade Iflap valve that is the least likely to experience reflux. Thedeteriorated gastroesophageal flap 55 of the GEFV 49 illustrates a GradeIII (almost Grade IV) flap valve. A Grade IV flap valve is the mostlikely to experience reflux. Grades II and III reflect intermediategrades of deterioration and, as in the case of III, a high likelihood ofexperiencing reflux. With the deteriorated GEFV represented bydeteriorated gastroesophageal flap 55 and the fundus 46 moved inferior,the stomach contents are presented a funnel-like opening directing thecontents into the esophagus 41 and the greatest likelihood ofexperiencing reflux. Disclosed subsequently are a device, assembly, andmethod, which may be employed to advantage according to an embodiment ofthe invention in restoring the normal gastroesophageal flap valveanatomy.

Referring now to FIG. 3, it shows an apparatus 100 according to anembodiment of the present invention positioned for the restoration of aGEFV. The apparatus 100 includes an elongated member 102 having a distalend 104 for transoral placement into the stomach 43. Carried on thedistal end of the elongated member 102 is a device 110 for restoring theGEFV. The device 110 includes a first member 114, hereinafter referredto as the chassis, and a second member 116, hereinafter referred to asthe bail. The chassis 114 and bail 116 are hingedly coupled at 117. Thechassis 114 and bail 116 form a tissue shaper which, as described incopending U.S. application Ser. No. 11/172,427 and incorporated hereinin its entirety by reference, shapes tissue of the stomach 43 into theflap of a restored gastroesophageal flap valve (GEFV).

The device 110 has a longitudinal passage to permit an endoscope 120 tobe guided through the device and into the stomach. This permits theendoscope to serve as a guide for guiding the device 110 through thepatient's throat, down the esophagus 41, and into the stomach. It alsopermits the gastroesophageal flap valve restoration procedure to beviewed at each stage of the procedure.

To facilitate shaping of the stomach tissue, the stomach tissue is drawnin between the chassis 114 and the bail 116. Further, to enable a flapof sufficient length to be formed to function as the flap of agastroesophageal flap valve, the stomach tissue is pulled down so thatthe fold line is substantially juxtaposed to the opening of theesophagus into the stomach. Hence, the stomach is first gripped at apoint out and away from the esophagus and the grip point is pulled toalmost the hinged connection 117 of the chassis 114 and bail 116. Asdescribed in copending application Ser. No. 11/001,666, filed Nov. 30,2004, entitled FLEXIBLE TRANSORAL ENDOSCOPIC GASTROESOPHAGEAL FLAP VALVERESTORATION DEVICE AND METHOD, which application is incorporated hereinby reference, the device 110 is fed down the esophagus with the bail 116substantially in line with the chassis 114. To negotiate the bend of thethroat, and as described in the aforementioned referenced application,the chassis 114 and bail 116 are rendered flexible. The chassis 114 isrendered flexible by slots 118 and the bail 116 is rendered flexible bythe hingedly coupled links 122. Further details concerning theflexibility of the chassis 114 and the bail 116 may be found in theaforementioned referenced application.

As further shown in FIG. 3, the device further includes a tissue gripper124. The gripper 124, in this embodiment, comprises a helical coil 125.The coil 125 is carried at the end of a cable 126 and may be attached tothe end of the cable or be formed from the cable. In this embodiment,the helical coil 125 is attached to the cable 126 and is preceded by aguide 128 whose function will be described subsequently.

The helical coil 125 is shown in an approximate position to engage thestomach tissue out and away from the opening of the esophagus to thestomach. The helical coil 125 is guided into position by a guidestructure 130 carried on the bail 116. The guide structure 130 comprisesa guide tube 132. When the device 110 is first introduced down theesophagus into the stomach, the helical coil 125 is caused to residewell within the guide tube 132 to preclude the helical coil fromaccidentally or inadvertently snagging esophageal or stomach tissue.

The guide tube includes a longitudinal slit 136 having a circuitousconfiguration. The slit 136 permits the end of the cable to release ordisassociate from the bail after the stomach tissue is gripped. Thecircuitous configuration of the slit 136 assures confinement of thecable 126 within the guide tube 132 until release of the cable isdesired. The proximal end of the slit 136 has an enlarged portion oropening (not shown). This opening permits the cable and helical coil toreenter the lumen when the device 110 is readied for a repeated stomachtissue shaping procedure. To that end, the guide 128 has a conicalsurface that serves to guide the cable end back into the opening of theslit 136.

With continued reference to FIG. 3, the device 110 further comprises afastener deployer 150. The fastener deployer includes at least onefastener deployment guide 152. The fastener deployment guide 152 takesthe form of a guide lumen. Although only one guide lumen 152 is shown,it will be appreciated that the device 110 may include a plurality ofsuch lumens without departing from the invention. The guide lumenterminates at a delivery point 154 where a fastener is driven into themolded stomach tissue. The fastener deployer may take the form of anyone of the assemblies fully described and claimed, for example, incopending U.S. application Ser. No. 11/043,903 which application isowned by the assignee of this invention and incorporated herein byreference.

The device 110 further includes a window 140 within the chassis 114. Thewindow is formed of a transparent or semi-transparent material. Thispermits gastroesophageal anatomy, and more importantly thegastroesophageal junction 52 (Z-line) to be viewed with the endoscope120. The window includes a location marker 142 which has a knownposition relative to the fastener delivery point 154. Hence, by aligningthe marker with a known anatomical structure, the fastener will bedelivered a known distance from or at a location having a predeterminedrelation to the marker. For example, by aligning the marker with orbelow the Z-line, it will be known that the fastener will be placedaboral of the Z-line and that serosa tissue will be fastened to serosatissue. As previously mentioned, this has many attendant benefits.

According to this embodiment, the apparatus 100 further includesinvaginator 155. The invaginator 155 is a double walled toroidalstructure 170 having a hollow center. A plurality of orifices 156communicate with the hollow center. These orifices 156, are used to pulla vacuum to cause the invaginator 155 to grip the tissue wall of theesophagus. This will serve to stabilize the esophagus and maintaindevice 110 positioning during the procedure. This vacuum gripping of theesophagus may also be used to particular advantage if the patientsuffers from a hiatal hernia.

More specifically, the invaginator 155 is so arranged with respect tothe elongated member 102 that, once the invaginator grips the esophagus41, the device is permitted very little axial movement with respect tothe invaginator but is permitted relatively free rotational movementwith respect to the invaginator. This permits the device 110 to berotated in increments for stomach tissue folding while maintaining asubstantially constant axial position within the stomach. Hence, theinvaginator 155 avoids the prior need of releasing the invaginator topermit device rotation and then realigning the device at the properaxial position for the next incremental folding procedure.

As may be best noted in FIG. 4, the invaginator 155 is seated against abearing surface portion 160 of the elongated member 102. The bearingsurface portion 160 is formed from a tubular member 162 which is securedin place by retention rings 164 and 166. The toroidal or ring structure170 circumscribes the bearing surface portion and is axially confinedbetween retention rings 164 and 166. The interior of the ring structure170 may be coupled to a vacuum source (not shown) through a flexibleconduit 180 and a lumen 182 in the elongated member 102. This permitsthe invaginator to non-invasively grip the esophagus through avacuum-grip applied through orifices 156. The conduit 180 may be coveredby a thin membrane or sheath (not shown) to help prevent the conduit 180from snagging during deployment.

The bearing surface portion 160 forms part of a bearing assembly 190coupling the invaginator 155 to the elongated member 102. The bearingassembly further includes an inner bearing surface 191 of the ringstructure 170. This bearing assembly 190 permits relatively freerelative rotational movement of the elongated member 102 and thus device110 with respect to the invaginator 155 and the anatomy.

The bearing assembly 190 may further include an optional bearing sleeve192 between the inner bearing surface 191 and bearing surface portion160 and axially between the retention rings 164 and 166. The sleeve 192serves to further reduce friction against the spaces between the sleeve192 and surface portion 160 and surface 191 may be packed with asuitable lubricant 194 to still further reduce rotational friction.

In use, as described in the aforementioned copending U.S. applicationSer. No. 11/172,427, the device 110 is introduced through the patient'smouth, throat, esophagus and into the stomach with the bail 116substantially in line with the chassis 114. After the z line is observedthrough the window 140 and the marker 142 set at or aboral of the zline, the stomach 43 is partially inflated to permit visualization withthe endoscope 120. This allows a first gripping site within the stomachfor the first fold to restore the GEFV. When the site is found, a vacuumis pulled through the invaginator 155 to grip the esophagus. The helix125 is then screwed into the stomach wall. The stomach is then pulledbetween the chassis 114 and the bail 116 to form a first fold and one ormore fasteners are delivered by the fastener deployer 150 to maintainthe first fold. Then, the helix 125 is released from the stomach tissue.

At this point in the prior art, it has been necessary to release theinvaginator vacuum grip to permit the assembly 100 to be rotated for thenext incremental fold. The position of the device 110 would then bechecked by moving the endoscope 120 back for visualizing the device andthe z line would be located through the window 140. The axial positionof the device would then be adjusted if necessary. The vacuum grip wouldthen be reestablished by the invaginator for the next incremental fold.

In contrast, by virtue of the invaginator of this embodiment, the vacuumgrip need not be interrupted to permit rotation of the device 110 in theproper position for the next incremental fold. Once the helix 125releases the tissue, the device may be rotated with the bearing assembly190. The next fold may then be made. No other repositioning of thedevice or manipulation of the endoscope is necessary.

To further assist maintaining the invaginator 155 in its axial positionon elongated member 102, or as a sole means along with conduit 180, theinvaginator 155 may be tethered to the chassis 114 by a flexiblenon-stretchable tether (not shown). This may serve to eliminate the needfor retention rings 164 and 166.

FIG. 5 shows another assembly 200 according to another embodiment of thepresent invention. The assembly 200 is essentially identical to theassembly 100 of FIG. 3 except for the design of the bearing surfaceportion 260, the invaginator 255, and the bearing assembly 290. Hencefor clarity, like reference numerals for like elements have been carriedover from FIG. 3 to FIG. 5.

FIG. 6 shows the bearing surface portion 260 and bearing assembly 290 ingreater detail. As may be noted, the bearing surface portion 260 is anextension of the elongated member 102 and is partly defined by a ring262 which creates an annular retention shoulder 264. The other end ofthe bearing surface portion 260 is sealed to another ring 266 carried bythe device 110 to form another retention shoulder 268. Again, theinvaginator 255 includes a hollow double walled ring 270 thatcircumscribes the bearing surface portion 260. The invaginator ring 255includes orifices 256 through which a vacuum may be drawn for vacuumgripping the esophagus. The vacuum is pulled through a conduit 280 thatextends along side and external to the elongated member 102.

The bearing assembly 290, according to this embodiment, includes a pairof bearing sleeves, an outer bearing sleeve 292 and an inner bearingsleeve 296. The bearing sleeves 292 and 296 are coaxially arranged aboutthe bearing surface portion 260. Again, a suitable lubricant 296 may beprovided between the inner bearing surface 291 of ring 270 and sleeve292, between sleeve 292 and sleeve 296, and between sleeve 296 and thebearing surface portion 260.

Each of the invaginators described herein may be rendered flexible bybeing formed of flexible material. This enables the invaginators toconform to non-circular structures while still permitting rotation.

The assembly 200 may be used as previously described with respect toassembly 100. The conduit 280 is preferably flexible to permitrelatively free rotational movement of the elongated member 102 anddevice 110 with respect to the invaginator ring 270 and hence theanatomy.

FIG. 7 shows another assembly 300 according to still another embodimentof the present invention. The assembly 300 is again essentiallyidentical to the assembly 100 of FIG. 3 in terms of the device 110 butdiffers in the design of the invaginator 355. Again, for clarity, likereference numerals for like elements have been carried over from FIG. 3to FIG. 7.

As may be noted in FIG. 7, the invaginator 355 is full length in that itmay extend orally along the length of and substantially coextensive withthe elongated member 102. The invaginator 355 still includes orifices356 through which a vacuum may be drawn for vacuum gripping theesophagus. The vacuum may be pulled through a conduit (not shown) or theannular space 380 between the elongated member 102 and the invaginator355.

According to this embodiment, the invaginator includes a sealed bearing390 permitting the elongated member 102 and device 110 to freely rotatewith respect to the invaginator 355. A suitable lubricant may beprovided between the bearing 390 and the device 110 at the adjoiningsurfaces 394.

The assembly 300 may be used as previously described with respect toassembly 100. The conduit invaginator 355 is preferably flexible topermit the assembly to be fed through the throat, and esophagus into thestomach 43.

While particular embodiments of the present invention have been shownand described, modifications may be made, and it is thereto intended inthe appended claims to cover all such changes and modifications whichfall within the true spirit and scope of the invention.

1. An assembly comprising: an elongated member configured to be fedthrough a throat, down an adjoining esophagus and into an associatedstomach, the elongated member having a distal end; a gastroesophagealflap valve restoration device carried on the distal end of the elongatedmember for placement in the stomach; and an invaginator carried by theelongated member, the invaginator being configured to grip theesophagus, the elongated member and invaginator being coupled forrestricted relative axial movement and substantially free relativerotational movement.
 2. The assembly of claim 1, wherein the invaginatoris configured to non-invasively grip the esophagus.
 3. The assembly ofclaim 2, wherein the invaginator is configured to vacuum-grip theesophagus.
 4. The assembly of claim 3, further comprising a conduit thatcouples the invaginator to a vacuum source.
 5. The assembly of claim 4,wherein the conduit comprises a lumen formed in the elongated member. 6.The assembly of claim 5, wherein the conduit further comprises a tubeconnecting the lumen to the invaginator.
 7. The assembly of claim 4,wherein the conduit comprises an elongated tubular member independent ofthe elongated member.
 8. The assembly of claim 1, wherein theinvaginator circumscribes the elongated member.
 9. The assembly of claim8, further comprising a lubricant between the invaginator and theelongated member.
 10. The assembly of claim 8, further comprising abearing assembly between the invaginator and the elongated member. 11.The assembly of claim 10, wherein the bearing assembly comprises atleast one bearing sleeve.
 12. The assembly of claim 11, furthercomprising a lubricant applied to the at least one bearing sleeve. 13.The assembly of claim 10, wherein the bearing assembly comprises aninner bearing sleeve and an outer bearing sleeve.
 14. The assembly ofclaim 13, wherein the inner bearing sleeve and outer bearing sleeve arecoaxially disposed between the invaginator and the elongated member. 15.The assembly of claim 13, further comprising a lubricant between theinner bearing sleeve and the outer bearing sleeve.
 16. The assembly ofclaim 1, wherein the elongated member includes a discrete axial lengthportion of reduced cross-sectional dimension and wherein the invaginatoris within the discrete axial length portion.
 17. The assembly of claim1, wherein the invaginator extends substantially coextensively along theelongated member.
 18. An assembly comprising: an elongated memberconfigured to be fed through a throat, down an adjoining esophagus andinto an associated stomach, the elongated member having a distal end; agastroesophageal flap valve restoration device carried on the distal endof the elongated member for placement in the stomach; and an invaginatorcarried by and circumscribing the elongated member, the invaginatorbeing configured to vacuum grip the esophagus, the elongated member andinvaginator being coupled for restricted relative axial movement andsubstantially free relative rotational movement.
 19. The assembly ofclaim 18 further comprising a lubricant between the invaginator and theelongated member.
 20. The assembly of claim 18, further comprising aconduit that couples the invaginator to a vacuum source.
 21. Theassembly of claim 20, wherein the conduit comprises a lumen formed inthe elongated member.
 22. The assembly of claim 21, wherein the conduitfurther comprises a tube connecting the lumen to the invaginator. 23.The assembly of claim 20, wherein the conduit comprises an elongatedtubular member independent of the elongated member.
 24. The assembly ofclaim 18, further comprising a bearing assembly between the invaginatorand the elongated member.
 25. The assembly of claim 24, wherein thebearing assembly comprises at least one bearing sleeve.
 26. The assemblyof claim 25, further comprising a lubricant applied to the at least onebearing sleeve.
 27. The assembly of claim 24, wherein the bearingassembly comprises an inner bearing sleeve and an outer bearing sleeve.28. The assembly of claim 27, wherein the inner bearing sleeve and outerbearing sleeve are coaxially disposed between the invaginator and theelongated member.
 29. The assembly of claim 27, further comprising alubricant between the inner bearing sleeve and the outer bearing sleeve.30. The assembly of claim 18, wherein the elongated member includes adiscrete axial length portion of reduced cross-sectional dimension andwherein the bearing assembly is within the discrete axial lengthportion.
 31. The assembly of claim 18, wherein the invaginator extendssubstantially coextensively along the elongated member. 32-61.(canceled)